Heap-based buffer overflow in Microsoft 365 Apps for Enterprise and Microsoft Office - CVE-2026-69285
Published: September 8, 2026
Vulnerability identifier: #VU147558
CSH Severity: High
CVSS v4: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-69285
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to a heap-based buffer overflow in Microsoft Office when opening a specially crafted file. A remote attacker can provide a specially crafted file to execute arbitrary code.
The Preview Pane is an attack vector, and user interaction is required.
Affected software
Microsoft 365 Apps for Enterprise
Microsoft Office
Microsoft Office
How to mitigate CVE-2026-69285
Install security update from vendor's website.
Microsoft 365 Apps for Enterprise - update to 16.0.20326.20138
Microsoft Office - addressed in versions 16.0.5569.1000, 16.0.10417.20207, 16.0.14334.20906, 16.0.17932.20976
Microsoft Office - addressed in versions 16.0.5569.1000, 16.0.10417.20207, 16.0.14334.20906, 16.0.17932.20976